✓Independent commercial truck repair✓Mississauga shop✓Written findings before repair✓Fleet & owner-operator support
Emissions faults that need proper diagnosis.
Modern aftertreatment systems depend on multiple sensors and operating conditions. One code does not always identify the failed component.
- DEF quality or level warnings
- SCR efficiency faults
- NOx sensor faults
- Dosing system concerns
- Emissions-related derate or inducement
Evidence before parts.
Testing varies by make, model, engine and fault set.
- Fault-code and freeze-frame review
- NOx and temperature data review
- DEF quality and dosing checks where applicable
- Wiring and connector inspection
- Post-repair verification
DEF & SCR Diagnostics in Mississauga — answered.
Does an SCR fault always mean the catalyst is bad?
No. Sensor, dosing, exhaust, wiring and engine operating issues can also cause SCR-related faults.
Can you diagnose NOx sensor faults?
Yes, where the vehicle and tooling are supported. We compare codes and live data before recommending replacement.
What should I send before the appointment?
Send the year, make, model, VIN and a photo of the warning messages or fault codes if available.
Book service
Tell us what the truck is doing.
Have the year, make, model, VIN, mileage, warning lights or fault codes, and whether the truck can be driven safely.
Mr Diesel Inc. · 5900 Dixie Rd, Unit 13, Mississauga ON L4W 1E9